Transcript The In and Out and Side of Pion Imaging: Closing Remarks

The Space-Time Puzzle at RHIC
Instead of slowly burning QGP Log Dt~R/vdef >>R
Evidence for Sudden freezeout Dt <<
R!
Amazingly independent of 1< KEcm< 100 AGeV
Yet there is Huge v2~0.15 out to 6 GeV, transverse
flow , hadro equilibration, pbar > pi-, …
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AGS-SPS-RHIC
Pion Interferometry
• Central AuAu (PbPb)
• Why saturation?
Y-Axis
• Why no rise in space or
temporal homogeneity?
X-Axis
Beam
Axis
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Amazingly Weak
Energy
dependence
M. Lisa et al., PRL 84, 2798 (2000)
R. Soltz et al., to be sub PRC
C. Adler et al., PRL 87, 082301
I.G. Bearden et al., EJP C18, 317 (2000)
p-
• Rout and Rside are energy
independent within error bars.
• Smooth energy dependence in
Rlong
• No immediate indication of
very different physics
A
• Fit Rlong to:
mT
• AGS: A = 2.19 +/- .05
• SPS: A = 2.90 +/- .10
• RHIC: A = 3.32 +/- .03
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HBT radii at 2 AGeV
M. Lisa
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Images of p--emitting sources (scaled
~ x1014)
~y 2
 1.35
2
~
x
y
similar to naïve
overlap: b~5 fm
y
x’
x’
2 AGeV
3 fm
z
y
qS=47°
x’
4 AGeV
z
6 AGeV
qS=37°
z
qS=33°
Large, positive
tilt angles
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x
x
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x
PHENIX and STAR at RHIC
Hydro+UrQMD
Soff, Bass, Dumitru (PRL 86)
Amazing!
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Rout/Rside vs. kT at AGS
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Why we expected more Rout>>Rside ?
t
Deflagration
(Q->H Burn Front)
vdef~dH/4dQ
Hadron
Gas
QGP
Dt~R/vdef
IFF
Combustion
Theory
Van Hove (83)
GKMS (84)
x
Qout
PION INTERFEROMETRY OF QUARK - GLUON PLASMA.
By S. Pratt (Minnesota U.). 1986.
Qside
Published in Phys.Rev.D33:1314-1327,1986
PION INTERFEROMETRY IN ULTRARELATIVISTIC HEAVY
ION COLLISIONS.
G. Bertsch, M. Gong, M. Tohyama, Phys.Rev.C37:1896-1900,1988.
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QGP EOS
Continuous Cross Over vs First Order Bag Model Equation of State
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D. Rischke , MG, NPA 613(97)397
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e0=20 GeV/fm3 evolved with hydro
The QGP Stall
DT=0
QGP
P=e/3
t~R
Stall
D. Rischke, MG NPA 613(97)397
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Pratt-Bertsch Cpp(qside,qout)
Side
DT/Tc=0
DT/Tc=0.1
P=e/3
qside
Out
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qout
D. Rischke, MG, NPA 613(97)397
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pp Rout/Rside
QGP-> Pions
th  R /10
QGP->Resonances
DT=0
P=e/3
DT=Tc/10
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D. Rischke, MG
NPA 613(97)397
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Effect of Rapid Thermalization
QGP-> Pions
QGP->Resonances
th  1/3T0
Tf=Tc
NULL
Solutions!!
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Dissipative Hadronic FSI distort pion lenses
Soff, Bass, Dumitru nucl-th/0012085
• long-lived dissipative hadronic phase dominates correlation signal
 dissipative hadronic phase: unavoidable consequence of thermalized QGP
IF strong incoherent resonance dynamics applies
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B.R. Schlei (QM 99) nucl-th/9904067
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Predicted
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The Thorn in Hydro’s side
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See D. Teany, E. Shuryak
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Useful cartoon showing why HBT in AA is not easy to unfold
P.Kolb, U. Heinz
MANY 8D xm-pn correlated geometries give same HBT radii
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P.Kolb, U. Heinz
Hydro (x,y,t,K) Correlated Geometries
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Denes Molnar’s Parton Cascade
Diffuse correlated geometries
Rside
Rout
xside
Rlong
xout
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Rout<Rside is possible
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Fits1/6/02
are NOT explanations but convenient summary
of data
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Are Systematic Experimental Errors Under Control?
Corrections
P.Filip
??
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More work on Coulomb correction needed
Better to show Uncorrected data and
compare to corrected theory !
P.Filip
Rsys
1fm
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Systematic Theory HBT Errors
Rth ~ 1fm
p
Wigner Wavepacket
x
Classical
Transport
Theory
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xp  /2
See also
S. Pratt …
Padula,Gavin MG
NPB 329 (90) 357
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Given Rth  Rexp ~ 2 fm Hydrodynamic HBT is surprisingly
good agreement with Rout,side !
D. Teany, E. Shuryak
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However, Rlong is tooo longg!
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New Attemps at sudden hadronization: Non-equilib Polyakov
V(L)
L(A)
But does this really
solve Rlong
Is short? U.Heinz
Is it consistent with small
e-b-e fluctuations?
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Closing Remarks: (Sorry no time for Event-by-Event fluct)
•RHIC HBT has posed a serious thorn in theory side
•V2, flow, hadron ratios are consistent with EULER hydro
up to pT~2 GeV, but hydro fails at AGS, SPS
Yet HBT pattern is ~uniform in energy
•High pt>2GeV tails reveal jet quenching through
very dense opaque matter
•
Yet hadronization is of short duration
(only marginally consistent with hydro Rout,side)
• Bjorken flow seems dead with short Rlong!
Is Landau resurrecting?
•Are we on wrong hydro/transport track?
Non-equilib classical fields? Inhomogeneous turbulence?
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• Also
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need to go back to basics and review HBT assumptions